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[SeaBIOS] [PATCH 2/4] SeaVGABIOS/vbe: Query driver for scanline pitch

Patrick Rudolph posted 4 patches 8 years, 1 month ago
[SeaBIOS] [PATCH 2/4] SeaVGABIOS/vbe: Query driver for scanline pitch
Posted by Patrick Rudolph 8 years, 1 month ago 
Query the driver for the real scanline pitch in bytes.

As cbvga doesn't change the pitch on mode change, always
return the same pitch, that might exceed width times Bytes-per-pixel.

Signed-off-by: Patrick Rudolph <siro@das-labor.org>
---
 vgasrc/bochsvga.c |  5 +++++
 vgasrc/bochsvga.h |  1 +
 vgasrc/cbvga.c    |  7 +++++++
 vgasrc/clext.c    |  5 +++++
 vgasrc/stdvga.c   |  5 +++++
 vgasrc/vbe.c      |  2 +-
 vgasrc/vgahw.h    | 10 ++++++++++
 vgasrc/vgautil.h  |  3 +++
 8 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/vgasrc/bochsvga.c b/vgasrc/bochsvga.c
index ec5d101..458b3a8 100644
--- a/vgasrc/bochsvga.c
+++ b/vgasrc/bochsvga.c
@@ -310,6 +310,11 @@ bochsvga_save_restore(int cmd, u16 seg, void *data)
     return ret + (VBE_DISPI_INDEX_Y_OFFSET-VBE_DISPI_INDEX_XRES+1)*sizeof(u16);
 }
 
+int
+bochsvga_get_linesize(struct vgamode_s *vmode_g)
+{
+    return DIV_ROUND_UP(vmode_g->width * vga_bpp(vmode_g), 8);
+}
 
 /****************************************************************
  * Mode setting
diff --git a/vgasrc/bochsvga.h b/vgasrc/bochsvga.h
index ae5f75d..40ce6f1 100644
--- a/vgasrc/bochsvga.h
+++ b/vgasrc/bochsvga.h
@@ -52,6 +52,7 @@ int bochsvga_get_dacformat(struct vgamode_s *vmode_g);
 int bochsvga_set_dacformat(struct vgamode_s *vmode_g, int val);
 int bochsvga_save_restore(int cmd, u16 seg, void *data);
 int bochsvga_set_mode(struct vgamode_s *vmode_g, int flags);
+int bochsvga_get_linesize(struct vgamode_s *vmode_g);
 int bochsvga_setup(void);
 
 #endif // bochsvga.h
diff --git a/vgasrc/cbvga.c b/vgasrc/cbvga.c
index 87ec77e..50e6e69 100644
--- a/vgasrc/cbvga.c
+++ b/vgasrc/cbvga.c
@@ -123,6 +123,13 @@ cbvga_set_mode(struct vgamode_s *vmode_g, int flags)
     return 0;
 }
 
+int
+cbvga_get_linesize(struct vgamode_s *vmode_g)
+{
+    /* Can't change mode, always report active pitch. */
+    return GET_GLOBAL(CBlinelength);
+}
+
 #define CB_TAG_FRAMEBUFFER      0x0012
 struct cb_framebuffer {
     u32 tag;
diff --git a/vgasrc/clext.c b/vgasrc/clext.c
index da8b790..08bc9b5 100644
--- a/vgasrc/clext.c
+++ b/vgasrc/clext.c
@@ -376,6 +376,11 @@ clext_save_restore(int cmd, u16 seg, void *data)
     return stdvga_save_restore(cmd, seg, data);
 }
 
+int
+clext_get_linesize(struct vgamode_s *vmode_g)
+{
+    return DIV_ROUND_UP(vmode_g->width * vga_bpp(vmode_g), 8);
+}
 
 /****************************************************************
  * Mode setting
diff --git a/vgasrc/stdvga.c b/vgasrc/stdvga.c
index 886deca..0e24297 100644
--- a/vgasrc/stdvga.c
+++ b/vgasrc/stdvga.c
@@ -321,6 +321,11 @@ stdvga_set_dacformat(struct vgamode_s *vmode_g, int val)
     return -1;
 }
 
+int
+stdvga_get_linesize(struct vgamode_s *vmode_g)
+{
+    return DIV_ROUND_UP(vmode_g->width * vga_bpp(vmode_g), 8);
+}
 
 /****************************************************************
  * Save/Restore state
diff --git a/vgasrc/vbe.c b/vgasrc/vbe.c
index facad19..724c1ba 100644
--- a/vgasrc/vbe.c
+++ b/vgasrc/vbe.c
@@ -107,7 +107,7 @@ vbe_104f01(struct bregs *regs)
     // Basic information about mode.
     int width = GET_GLOBAL(vmode_g->width);
     int height = GET_GLOBAL(vmode_g->height);
-    int linesize = DIV_ROUND_UP(width * vga_bpp(vmode_g), 8);
+    int linesize = vgahw_get_linesize(vmode_g);
     SET_FARVAR(seg, info->bytes_per_scanline, linesize);
     SET_FARVAR(seg, info->xres, width);
     SET_FARVAR(seg, info->yres, height);
diff --git a/vgasrc/vgahw.h b/vgasrc/vgahw.h
index dab2b4d..5839643 100644
--- a/vgasrc/vgahw.h
+++ b/vgasrc/vgahw.h
@@ -139,4 +139,14 @@ static inline int vgahw_save_restore(int cmd, u16 seg, void *data) {
     return stdvga_save_restore(cmd, seg, data);
 }
 
+static inline int vgahw_get_linesize(struct vgamode_s *vmode_g) {
+    if (CONFIG_VGA_CIRRUS)
+        return clext_get_linesize(vmode_g);
+    if (CONFIG_VGA_BOCHS)
+        return bochsvga_get_linesize(vmode_g);
+    if (CONFIG_VGA_COREBOOT)
+        return cbvga_get_linesize(vmode_g);
+    return stdvga_get_linesize(vmode_g);
+}
+
 #endif // vgahw.h
diff --git a/vgasrc/vgautil.h b/vgasrc/vgautil.h
index 08c4e8d..4b6f5b9 100644
--- a/vgasrc/vgautil.h
+++ b/vgasrc/vgautil.h
@@ -17,6 +17,7 @@ int cbvga_get_dacformat(struct vgamode_s *vmode_g);
 int cbvga_set_dacformat(struct vgamode_s *vmode_g, int val);
 int cbvga_save_restore(int cmd, u16 seg, void *data);
 int cbvga_set_mode(struct vgamode_s *vmode_g, int flags);
+int cbvga_get_linesize(struct vgamode_s *vmode_g);
 int cbvga_setup(void);
 
 // clext.c
@@ -30,6 +31,7 @@ int clext_get_displaystart(struct vgamode_s *vmode_g);
 int clext_set_displaystart(struct vgamode_s *vmode_g, int val);
 int clext_save_restore(int cmd, u16 seg, void *data);
 int clext_set_mode(struct vgamode_s *vmode_g, int flags);
+int clext_get_linesize(struct vgamode_s *vmode_g);
 struct bregs;
 void clext_1012(struct bregs *regs);
 int clext_setup(void);
@@ -63,6 +65,7 @@ void stdvga_list_modes(u16 seg, u16 *dest, u16 *last);
 void stdvga_build_video_param(void);
 void stdvga_override_crtc(int mode, u8 *crtc);
 int stdvga_set_mode(struct vgamode_s *vmode_g, int flags);
+int stdvga_get_linesize(struct vgamode_s *vmode_g);
 void stdvga_set_packed_palette(void);
 
 // swcursor.c
-- 
2.7.4


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Re: [SeaBIOS] [PATCH 2/4] SeaVGABIOS/vbe: Query driver for scanline pitch
Posted by Kevin O'Connor 8 years, 1 month ago 
On Fri, Mar 17, 2017 at 05:49:40PM +0100, Patrick Rudolph wrote:
> Query the driver for the real scanline pitch in bytes.
> 
> As cbvga doesn't change the pitch on mode change, always
> return the same pitch, that might exceed width times Bytes-per-pixel.
> 
> Signed-off-by: Patrick Rudolph <siro@das-labor.org>
> ---
>  vgasrc/bochsvga.c |  5 +++++
>  vgasrc/bochsvga.h |  1 +
>  vgasrc/cbvga.c    |  7 +++++++
>  vgasrc/clext.c    |  5 +++++
>  vgasrc/stdvga.c   |  5 +++++
>  vgasrc/vbe.c      |  2 +-
>  vgasrc/vgahw.h    | 10 ++++++++++
>  vgasrc/vgautil.h  |  3 +++
>  8 files changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/vgasrc/bochsvga.c b/vgasrc/bochsvga.c
> index ec5d101..458b3a8 100644
> --- a/vgasrc/bochsvga.c
> +++ b/vgasrc/bochsvga.c
> @@ -310,6 +310,11 @@ bochsvga_save_restore(int cmd, u16 seg, void *data)
>      return ret + (VBE_DISPI_INDEX_Y_OFFSET-VBE_DISPI_INDEX_XRES+1)*sizeof(u16);
>  }
>  
> +int
> +bochsvga_get_linesize(struct vgamode_s *vmode_g)
> +{
> +    return DIV_ROUND_UP(vmode_g->width * vga_bpp(vmode_g), 8);
> +}
>  
>  /****************************************************************
>   * Mode setting
> diff --git a/vgasrc/bochsvga.h b/vgasrc/bochsvga.h
> index ae5f75d..40ce6f1 100644
> --- a/vgasrc/bochsvga.h
> +++ b/vgasrc/bochsvga.h
> @@ -52,6 +52,7 @@ int bochsvga_get_dacformat(struct vgamode_s *vmode_g);
>  int bochsvga_set_dacformat(struct vgamode_s *vmode_g, int val);
>  int bochsvga_save_restore(int cmd, u16 seg, void *data);
>  int bochsvga_set_mode(struct vgamode_s *vmode_g, int flags);
> +int bochsvga_get_linesize(struct vgamode_s *vmode_g);
>  int bochsvga_setup(void);
>  
>  #endif // bochsvga.h
> diff --git a/vgasrc/cbvga.c b/vgasrc/cbvga.c
> index 87ec77e..50e6e69 100644
> --- a/vgasrc/cbvga.c
> +++ b/vgasrc/cbvga.c
> @@ -123,6 +123,13 @@ cbvga_set_mode(struct vgamode_s *vmode_g, int flags)
>      return 0;
>  }
>  
> +int
> +cbvga_get_linesize(struct vgamode_s *vmode_g)
> +{
> +    /* Can't change mode, always report active pitch. */
> +    return GET_GLOBAL(CBlinelength);
> +}
> +
>  #define CB_TAG_FRAMEBUFFER      0x0012
>  struct cb_framebuffer {
>      u32 tag;
> diff --git a/vgasrc/clext.c b/vgasrc/clext.c
> index da8b790..08bc9b5 100644
> --- a/vgasrc/clext.c
> +++ b/vgasrc/clext.c
> @@ -376,6 +376,11 @@ clext_save_restore(int cmd, u16 seg, void *data)
>      return stdvga_save_restore(cmd, seg, data);
>  }
>  
> +int
> +clext_get_linesize(struct vgamode_s *vmode_g)
> +{
> +    return DIV_ROUND_UP(vmode_g->width * vga_bpp(vmode_g), 8);
> +}
>  
>  /****************************************************************
>   * Mode setting
> diff --git a/vgasrc/stdvga.c b/vgasrc/stdvga.c
> index 886deca..0e24297 100644
> --- a/vgasrc/stdvga.c
> +++ b/vgasrc/stdvga.c
> @@ -321,6 +321,11 @@ stdvga_set_dacformat(struct vgamode_s *vmode_g, int val)
>      return -1;
>  }
>  
> +int
> +stdvga_get_linesize(struct vgamode_s *vmode_g)
> +{
> +    return DIV_ROUND_UP(vmode_g->width * vga_bpp(vmode_g), 8);
> +}
>  
>  /****************************************************************
>   * Save/Restore state
> diff --git a/vgasrc/vbe.c b/vgasrc/vbe.c
> index facad19..724c1ba 100644
> --- a/vgasrc/vbe.c
> +++ b/vgasrc/vbe.c
> @@ -107,7 +107,7 @@ vbe_104f01(struct bregs *regs)
>      // Basic information about mode.
>      int width = GET_GLOBAL(vmode_g->width);
>      int height = GET_GLOBAL(vmode_g->height);
> -    int linesize = DIV_ROUND_UP(width * vga_bpp(vmode_g), 8);
> +    int linesize = vgahw_get_linesize(vmode_g);
>      SET_FARVAR(seg, info->bytes_per_scanline, linesize);
>      SET_FARVAR(seg, info->xres, width);
>      SET_FARVAR(seg, info->yres, height);
> diff --git a/vgasrc/vgahw.h b/vgasrc/vgahw.h
> index dab2b4d..5839643 100644
> --- a/vgasrc/vgahw.h
> +++ b/vgasrc/vgahw.h
> @@ -139,4 +139,14 @@ static inline int vgahw_save_restore(int cmd, u16 seg, void *data) {
>      return stdvga_save_restore(cmd, seg, data);
>  }
>  
> +static inline int vgahw_get_linesize(struct vgamode_s *vmode_g) {
> +    if (CONFIG_VGA_CIRRUS)
> +        return clext_get_linesize(vmode_g);
> +    if (CONFIG_VGA_BOCHS)
> +        return bochsvga_get_linesize(vmode_g);
> +    if (CONFIG_VGA_COREBOOT)
> +        return cbvga_get_linesize(vmode_g);
> +    return stdvga_get_linesize(vmode_g);
> +}

Minor nit - I think it would be preferable if this was:

static inline int vgahw_get_linesize(struct vgamode_s *vmode_g) {
    if (CONFIG_VGA_COREBOOT)
        return cbvga_get_linesize(vmode_g);
    return stdvga_get_linesize(vmode_g);
}

to reduce the duplicate code in the cirrus/bochs implementations.

Thanks.
-Kevin

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